<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Js 正则表达式 | Saturday_</title><meta name="keywords" content="js,javascript,RegExp,正则,test,match,replace"><meta name="author" content="HHR"><meta name="copyright" content="HHR"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta name="description" content="1. 正则表达式的作用给定的字符串是否符合正则表达式的过滤逻辑 ( 匹配 )可以通过正则表达式，从字符串中获取我们想要的特定部分 ( 提取 )强大的字符串替换能力 ( 替换 ) 2. 正则的组成(1) 特殊字符普通数字 , 字母 , 中文 , 符号 , 特殊字符 . . . (2) 常用元字符   元字符 说明    \d 匹配至少一个数字   \D 匹配至少一个除数字外的任意字符   \w 匹配">
<meta property="og:type" content="article">
<meta property="og:title" content="Js 正则表达式">
<meta property="og:url" content="https://codehhr.cn/2021/06/19/js/js-regexp/index.html">
<meta property="og:site_name" content="Saturday_">
<meta property="og:description" content="1. 正则表达式的作用给定的字符串是否符合正则表达式的过滤逻辑 ( 匹配 )可以通过正则表达式，从字符串中获取我们想要的特定部分 ( 提取 )强大的字符串替换能力 ( 替换 ) 2. 正则的组成(1) 特殊字符普通数字 , 字母 , 中文 , 符号 , 特殊字符 . . . (2) 常用元字符   元字符 说明    \d 匹配至少一个数字   \D 匹配至少一个除数字外的任意字符   \w 匹配">
<meta property="og:locale" content="zh_CN">
<meta property="og:image" content="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png">
<meta property="article:published_time" content="2021-06-19T07:06:18.000Z">
<meta property="article:modified_time" content="2021-06-20T06:19:22.446Z">
<meta property="article:author" content="HHR">
<meta property="article:tag" content="js">
<meta property="article:tag" content="javascript">
<meta property="article:tag" content="RegExp">
<meta property="article:tag" content="正则">
<meta property="article:tag" content="test">
<meta property="article:tag" content="match">
<meta property="article:tag" content="replace">
<meta name="twitter:card" content="summary">
<meta name="twitter:image" content="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png"><link rel="shortcut icon" href="/img/favicon.ico"><link rel="canonical" href="https://codehhr.cn/2021/06/19/js/js-regexp/"><link rel="preconnect" href="//cdn.jsdelivr.net"/><link rel="preconnect" href="//busuanzi.ibruce.info"/><link rel="stylesheet" href="/css/index.css"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free/css/all.min.css" media="print" onload="this.media='all'"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.css" media="print" onload="this.media='all'"><script>const GLOBAL_CONFIG = { 
  root: '/',
  algolia: undefined,
  localSearch: {"path":"search.xml","languages":{"hits_empty":"找不到您查询的内容：${query}"}},
  translate: {"defaultEncoding":2,"translateDelay":0,"msgToTraditionalChinese":"繁","msgToSimplifiedChinese":"简"},
  noticeOutdate: {"limitDay":680,"position":"top","messagePrev":"It has been","messageNext":"days since the last update, the content of the article may be outdated."},
  highlight: {"plugin":"highlighjs","highlightCopy":true,"highlightLang":true,"highlightHeightLimit":false},
  copy: {
    success: '复制成功',
    error: '复制错误',
    noSupport: '浏览器不支持'
  },
  relativeDate: {
    homepage: true,
    post: false
  },
  runtime: '天',
  date_suffix: {
    just: '刚刚',
    min: '分钟前',
    hour: '小时前',
    day: '天前',
    month: '个月前'
  },
  copyright: {"limitCount":50,"languages":{"author":"作者: HHR","link":"链接: ","source":"来源: Saturday_","info":"著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。"}},
  lightbox: 'fancybox',
  Snackbar: {"chs_to_cht":"你已切换为繁体","cht_to_chs":"你已切换为简体","day_to_night":"你已切换为深色模式","night_to_day":"你已切换为浅色模式","bgLight":"#49b1f5","bgDark":"#121212","position":"top-center"},
  source: {
    jQuery: 'https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js',
    justifiedGallery: {
      js: 'https://cdn.jsdelivr.net/npm/justifiedGallery/dist/js/jquery.justifiedGallery.min.js',
      css: 'https://cdn.jsdelivr.net/npm/justifiedGallery/dist/css/justifiedGallery.min.css'
    },
    fancybox: {
      js: 'https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js',
      css: 'https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.css'
    }
  },
  isPhotoFigcaption: false,
  islazyload: true,
  isanchor: true
}</script><script id="config-diff">var GLOBAL_CONFIG_SITE = {
  title: 'Js 正则表达式',
  isPost: true,
  isHome: false,
  isHighlightShrink: false,
  isToc: true,
  postUpdate: '2021-06-20 14:19:22'
}</script><noscript><style type="text/css">
  #nav {
    opacity: 1
  }
  .justified-gallery img {
    opacity: 1
  }

  #recent-posts time,
  #post-meta time {
    display: inline !important
  }
</style></noscript><script>(win=>{
    win.saveToLocal = {
      set: function setWithExpiry(key, value, ttl) {
        if (ttl === 0) return
        const now = new Date()
        const expiryDay = ttl * 86400000
        const item = {
          value: value,
          expiry: now.getTime() + expiryDay,
        }
        localStorage.setItem(key, JSON.stringify(item))
      },

      get: function getWithExpiry(key) {
        const itemStr = localStorage.getItem(key)

        if (!itemStr) {
          return undefined
        }
        const item = JSON.parse(itemStr)
        const now = new Date()

        if (now.getTime() > item.expiry) {
          localStorage.removeItem(key)
          return undefined
        }
        return item.value
      }
    }
  
    win.getScript = url => new Promise((resolve, reject) => {
      const script = document.createElement('script')
      script.src = url
      script.async = true
      script.onerror = reject
      script.onload = script.onreadystatechange = function() {
        const loadState = this.readyState
        if (loadState && loadState !== 'loaded' && loadState !== 'complete') return
        script.onload = script.onreadystatechange = null
        resolve()
      }
      document.head.appendChild(script)
    })
  
      win.activateDarkMode = function () {
        document.documentElement.setAttribute('data-theme', 'dark')
        if (document.querySelector('meta[name="theme-color"]') !== null) {
          document.querySelector('meta[name="theme-color"]').setAttribute('content', '#0d0d0d')
        }
      }
      win.activateLightMode = function () {
        document.documentElement.setAttribute('data-theme', 'light')
        if (document.querySelector('meta[name="theme-color"]') !== null) {
          document.querySelector('meta[name="theme-color"]').setAttribute('content', '#ffffff')
        }
      }
      const t = saveToLocal.get('theme')
    
          if (t === 'dark') activateDarkMode()
          else if (t === 'light') activateLightMode()
        
      const asideStatus = saveToLocal.get('aside-status')
      if (asideStatus !== undefined) {
        if (asideStatus === 'hide') {
          document.documentElement.classList.add('hide-aside')
        } else {
          document.documentElement.classList.remove('hide-aside')
        }
      }
    
    const fontSizeVal = saveToLocal.get('global-font-size')
    if (fontSizeVal !== undefined) {
      document.documentElement.style.setProperty('--global-font-size', fontSizeVal + 'px')
    }
    
    const detectApple = () => {
      if (GLOBAL_CONFIG_SITE.isHome && /iPad|iPhone|iPod|Macintosh/.test(navigator.userAgent)){
        document.documentElement.classList.add('apple')
      }
    }
    detectApple()
    })(window)</script><script src="/js/jquery.min.js"></script><link rel="stylesheet" href="/css/cursor.css"><link rel="stylesheet" href="/css/footergradient.css"><link rel="stylesheet" href="/css/scrollbar.css"><link rel="stylesheet" href="/css/animate.min.css"><meta name="generator" content="Hexo 5.4.0"><link rel="alternate" href="/atom.xml" title="Saturday_" type="application/atom+xml">
</head><body><div id="loading-box"><div class="loading-left-bg"></div><div class="loading-right-bg"></div><div class="spinner-box"><div class="configure-border-1"><div class="configure-core"></div></div><div class="configure-border-2"><div class="configure-core"></div></div><div class="loading-word">加载中...</div></div></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="onerror=null;src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/archives/"><div class="headline">文章</div><div class="length-num">87</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/tags/"><div class="headline">标签</div><div class="length-num">120</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/categories/"><div class="headline">分类</div><div class="length-num">31</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fas fa-image"></i><span> 照片</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/school/"><i class="fa-fw fas fa-graduation-cap"></i><span> 科大</span></a></li><li><a class="site-page child" href="/wallpaper/"><i class="fa-fw fas fa-image"></i><span> 壁纸</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div><div class="menus_item"><a class="site-page" href="/messageboard/"><i class="fa-fw fas fa-paper-plane"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fa fa-list"></i><span> 娱乐</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li></ul></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/csslayouts/sunrise.jpg')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">Saturday_</a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fas fa-image"></i><span> 照片</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/school/"><i class="fa-fw fas fa-graduation-cap"></i><span> 科大</span></a></li><li><a class="site-page child" href="/wallpaper/"><i class="fa-fw fas fa-image"></i><span> 壁纸</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div><div class="menus_item"><a class="site-page" href="/messageboard/"><i class="fa-fw fas fa-paper-plane"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fa fa-list"></i><span> 娱乐</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li></ul></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Js 正则表达式</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-06-19T07:06:18.000Z" title="发表于 2021-06-19 15:06:18">2021-06-19</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-06-20T06:19:22.446Z" title="更新于 2021-06-20 14:19:22">2021-06-20</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/js/">js</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">837</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>3分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Js 正则表达式"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="1-正则表达式的作用"><a href="#1-正则表达式的作用" class="headerlink" title="1. 正则表达式的作用"></a>1. 正则表达式的作用</h1><p>给定的字符串是否符合正则表达式的过滤逻辑 ( 匹配 )<br>可以通过正则表达式，从字符串中获取我们想要的特定部分 ( 提取 )<br>强大的字符串替换能力 ( 替换 )</p>
<h1 id="2-正则的组成"><a href="#2-正则的组成" class="headerlink" title="2. 正则的组成"></a>2. 正则的组成</h1><h2 id="1-特殊字符"><a href="#1-特殊字符" class="headerlink" title="(1) 特殊字符"></a>(1) 特殊字符</h2><p>普通数字 , 字母 , 中文 , 符号 , 特殊字符 . . .</p>
<h2 id="2-常用元字符"><a href="#2-常用元字符" class="headerlink" title="(2) 常用元字符"></a>(2) 常用元字符</h2><table>
<thead>
<tr>
<th align="center">元字符</th>
<th align="left">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">\d</td>
<td align="left">匹配至少一个数字</td>
</tr>
<tr>
<td align="center">\D</td>
<td align="left">匹配至少一个除数字外的任意字符</td>
</tr>
<tr>
<td align="center">\w</td>
<td align="left">匹配至少一个字母或数字或下划线 ( _ )</td>
</tr>
<tr>
<td align="center">\W</td>
<td align="left">匹配至少一个非字母或数字或下划线</td>
</tr>
<tr>
<td align="center">\s</td>
<td align="left">匹配至少一个空白字符</td>
</tr>
<tr>
<td align="center">\S</td>
<td align="left">匹配至少一个非空白任意字符</td>
</tr>
<tr>
<td align="center">.</td>
<td align="left">匹配除换行符以外的任意单个字符</td>
</tr>
<tr>
<td align="center">^</td>
<td align="left">匹配行首的文本 ( 以谁开始 )</td>
</tr>
<tr>
<td align="center">$</td>
<td align="left">匹配行尾的文本 ( 以谁结束 )</td>
</tr>
</tbody></table>
<h2 id="3-限定符"><a href="#3-限定符" class="headerlink" title="(3) 限定符"></a>(3) 限定符</h2><table>
<thead>
<tr>
<th align="center">限定符</th>
<th align="left">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">*</td>
<td align="left">重复零次或更多次</td>
</tr>
<tr>
<td align="center">+</td>
<td align="left">重复一次或多次</td>
</tr>
<tr>
<td align="center">?</td>
<td align="left">重复零次或一次</td>
</tr>
<tr>
<td align="center">{n}</td>
<td align="left">重复 n 次</td>
</tr>
<tr>
<td align="center">{n,}</td>
<td align="left">至少重复 n 次</td>
</tr>
<tr>
<td align="center">{n,m}</td>
<td align="left">重复 n 到 m 次</td>
</tr>
</tbody></table>
<h2 id="4-其他符号"><a href="#4-其他符号" class="headerlink" title="(4) 其他符号"></a>(4) 其他符号</h2><table>
<thead>
<tr>
<th align="center">其他符号</th>
<th align="left">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">[]</td>
<td align="left">字符串用中括号括起来，表示匹配其中的任一字符 , 相当于或的意思, 比如 0 到 9 : [0-9]</td>
</tr>
<tr>
<td align="center">[^]</td>
<td align="left">匹配除中括号以内的内容 , 比如 [^0-9] , 就是除了 0 到 9 之外的内容</td>
</tr>
<tr>
<td align="center">\</td>
<td align="left">转义符： \ 的用法主要是用法是在正则表达式中的特殊符号转换为它本身的意思</td>
</tr>
<tr>
<td align="center">|</td>
<td align="left">或者，选择两者中的一个。注意将左右两边分为两部分，而不管左右两边有多长多乱</td>
</tr>
<tr>
<td align="center">( )</td>
<td align="left">从两个直接量中选择一个</td>
</tr>
<tr>
<td align="center">[\u4e00-\u9fa5]</td>
<td align="left">匹配汉字</td>
</tr>
</tbody></table>
<h1 id="3-创建正则对象"><a href="#3-创建正则对象" class="headerlink" title="3. 创建正则对象"></a>3. 创建正则对象</h1><h2 id="1-字面量创建"><a href="#1-字面量创建" class="headerlink" title="(1) 字面量创建"></a>(1) 字面量创建</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> reg = <span class="regexp">/\d/</span>;</span><br></pre></td></tr></table></figure>

<h2 id="2-构造函数创建"><a href="#2-构造函数创建" class="headerlink" title="(2) 构造函数创建"></a>(2) 构造函数创建</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> regObj = <span class="keyword">new</span> <span class="built_in">RegExp</span>(<span class="regexp">/\d/</span>);</span><br></pre></td></tr></table></figure>

<h1 id="4-正则匹配"><a href="#4-正则匹配" class="headerlink" title="4. 正则匹配"></a>4. 正则匹配</h1><p>在 <code>RegExp</code> 的原型上有个 <code>test</code> 方法,用类测试是否匹配成功</p>
<p><code>RegExp.prototype.test()</code></p>
<p><strong>语法</strong> :<code>reg.test(str)</code><br><strong>参数</strong> : <code>str</code> 与正则表达式匹配的字符串<br><strong>返回值</strong> : 如果正则表达式与指定的字符串匹配 , 返回 <code>true</code> ; 否则 <code>false</code></p>
<p><strong>案例 :</strong></p>
<p><strong>html</strong></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;email&quot;</span> <span class="attr">name</span>=<span class="string">&quot;&quot;</span> <span class="attr">id</span>=<span class="string">&quot;&quot;</span> /&gt;</span> <span class="tag">&lt;<span class="name">button</span>&gt;</span>提交<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>js</strong></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 验证输入邮箱</span></span><br><span class="line"><span class="keyword">var</span> reg = <span class="regexp">/^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]&#123;2,4&#125;)$/</span>;</span><br><span class="line"><span class="built_in">document</span>.querySelector(<span class="string">&quot;button&quot;</span>).addEventListener(<span class="string">&quot;click&quot;</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="keyword">var</span> value = <span class="built_in">document</span>.querySelector(<span class="string">&quot;input&quot;</span>).value;</span><br><span class="line">  <span class="built_in">console</span>.log(reg.test(value));</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<h1 id="5-正则提取"><a href="#5-正则提取" class="headerlink" title="5. 正则提取"></a>5. 正则提取</h1><p><code>String.prototype.match()</code></p>
<p><strong>语法</strong> : <code>str.match(reg)</code><br><strong>参数</strong> : <code>reg</code><br><strong>返回值 :</strong> 如果使用 <code>g</code> 标志，则将返回与完整正则表达式匹配的所有结果 ( <code>Array</code> ), 但不会返回捕获组 , 或者未匹配返回 <code> null</code><br>如果未使用 <code>g</code> 标志，则仅返回第一个完整匹配及其相关的捕获组( <code>Array</code> ) 或者未匹配返回 <code> null</code></p>
<p><strong>案例 :</strong></p>
<p><strong>html</strong></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">name</span>=<span class="string">&quot;&quot;</span> <span class="attr">id</span>=<span class="string">&quot;&quot;</span> /&gt;</span> <span class="tag">&lt;<span class="name">button</span>&gt;</span>提取<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>js</strong></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 提取非数字</span></span><br><span class="line"><span class="keyword">var</span> reg = <span class="regexp">/[^\d]/g</span>;</span><br><span class="line"><span class="built_in">document</span>.querySelector(<span class="string">&quot;button&quot;</span>).addEventListener(<span class="string">&quot;click&quot;</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="keyword">var</span> value = <span class="built_in">document</span>.querySelector(<span class="string">&quot;input&quot;</span>).value;</span><br><span class="line">  <span class="built_in">console</span>.log(value.match(reg));</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<h1 id="6-正则替换"><a href="#6-正则替换" class="headerlink" title="6. 正则替换"></a>6. 正则替换</h1><p><code>String.prototype.replace()</code></p>
<p><strong>原字符串不会改变</strong></p>
<p><strong>语法</strong> : <code>str.replace(regexp|substr, newSubStr|function)</code></p>
<p><strong>返回值 :</strong> 替代后的新的字符串。</p>
<p><strong>案例 :</strong><br>全局匹配,将 “ l “ 替换为 “ L “</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> str = <span class="string">&quot;Hello World!&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(str.replace(<span class="regexp">/l/g</span>, <span class="string">&quot;L&quot;</span>));</span><br></pre></td></tr></table></figure>

<h1 id="The-End"><a href="#The-End" class="headerlink" title="The_End"></a>The_End</h1></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">HHR</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://codehhr.cn/2021/06/19/js/js-regexp/">https://codehhr.cn/2021/06/19/js/js-regexp/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://codehhr.cn" target="_blank">Saturday_</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/js/">js</a><a class="post-meta__tags" href="/tags/javascript/">javascript</a><a class="post-meta__tags" href="/tags/RegExp/">RegExp</a><a class="post-meta__tags" href="/tags/%E6%AD%A3%E5%88%99/">正则</a><a class="post-meta__tags" href="/tags/test/">test</a><a class="post-meta__tags" href="/tags/match/">match</a><a class="post-meta__tags" href="/tags/replace/">replace</a></div><div class="post_share"><div class="social-share" data-image="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" data-sites="facebook,twitter,wechat,weibo,qq"></div><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/social-share.js/dist/css/share.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/social-share.js/dist/js/social-share.min.js" defer></script></div></div><nav class="pagination-post" id="pagination"><div class="prev-post pull-left"><a href="/2021/06/19/js/js-remove-array-duplicates/"><img class="prev-cover" src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" onerror="onerror=null;src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="cover of previous post"><div class="pagination-info"><div class="label">上一篇</div><div class="prev_info">Js 数组去重方法总结</div></div></a></div><div class="next-post pull-right"><a href="/2021/06/19/js/js-deepclone/"><img class="next-cover" src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" onerror="onerror=null;src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="cover of next post"><div class="pagination-info"><div class="label">下一篇</div><div class="next_info">Js 实现递归深拷贝</div></div></a></div></nav><div class="relatedPosts"><div class="headline"><i class="fas fa-thumbs-up fa-fw"></i><span> 相关推荐</span></div><div class="relatedPosts-list"><div><a href="/2021/06/19/js/es6-day01/" title="ES6 新增用法 ( 一 )"><img class="cover" src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2021-06-29</div><div class="title">ES6 新增用法 ( 一 )</div></div></a></div><div><a href="/2021/06/20/js/es6-day02/" title="ES6 新增用法 ( 二 )"><img class="cover" src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2021-06-25</div><div class="title">ES6 新增用法 ( 二 )</div></div></a></div><div><a href="/2021/06/23/js/es6-day03/" title="ES6 新增用法 ( 三 )"><img class="cover" src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2021-06-24</div><div class="title">ES6 新增用法 ( 三 )</div></div></a></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="avatar"/></div><div class="author-info__name">HHR</div><div class="author-info__description">Linux is great ~</div></div><div class="card-info-data"><div class="card-info-data-item is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">87</div></a></div><div class="card-info-data-item is-center"><a href="/tags/"><div class="headline">标签</div><div class="length-num">120</div></a></div><div class="card-info-data-item is-center"><a href="/categories/"><div class="headline">分类</div><div class="length-num">31</div></a></div></div><a class="button--animated" id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/codehhr"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/codehhr" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:1871973389@qq.com" target="_blank" title="Email"><i class="fas fa-envelope"></i></a><a class="social-icon" href="/atom.xml" target="_blank" title="RSS"><i class="fas fa-rss"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">评论关了, 图床也挂了</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#1-%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E7%9A%84%E4%BD%9C%E7%94%A8"><span class="toc-number">1.</span> <span class="toc-text">1. 正则表达式的作用</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#2-%E6%AD%A3%E5%88%99%E7%9A%84%E7%BB%84%E6%88%90"><span class="toc-number">2.</span> <span class="toc-text">2. 正则的组成</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E7%89%B9%E6%AE%8A%E5%AD%97%E7%AC%A6"><span class="toc-number">2.1.</span> <span class="toc-text">(1) 特殊字符</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E5%B8%B8%E7%94%A8%E5%85%83%E5%AD%97%E7%AC%A6"><span class="toc-number">2.2.</span> <span class="toc-text">(2) 常用元字符</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-%E9%99%90%E5%AE%9A%E7%AC%A6"><span class="toc-number">2.3.</span> <span class="toc-text">(3) 限定符</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-%E5%85%B6%E4%BB%96%E7%AC%A6%E5%8F%B7"><span class="toc-number">2.4.</span> <span class="toc-text">(4) 其他符号</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#3-%E5%88%9B%E5%BB%BA%E6%AD%A3%E5%88%99%E5%AF%B9%E8%B1%A1"><span class="toc-number">3.</span> <span class="toc-text">3. 创建正则对象</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E5%AD%97%E9%9D%A2%E9%87%8F%E5%88%9B%E5%BB%BA"><span class="toc-number">3.1.</span> <span class="toc-text">(1) 字面量创建</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E6%9E%84%E9%80%A0%E5%87%BD%E6%95%B0%E5%88%9B%E5%BB%BA"><span class="toc-number">3.2.</span> <span class="toc-text">(2) 构造函数创建</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#4-%E6%AD%A3%E5%88%99%E5%8C%B9%E9%85%8D"><span class="toc-number">4.</span> <span class="toc-text">4. 正则匹配</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#5-%E6%AD%A3%E5%88%99%E6%8F%90%E5%8F%96"><span class="toc-number">5.</span> <span class="toc-text">5. 正则提取</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#6-%E6%AD%A3%E5%88%99%E6%9B%BF%E6%8D%A2"><span class="toc-number">6.</span> <span class="toc-text">6. 正则替换</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#The-End"><span class="toc-number">7.</span> <span class="toc-text">The_End</span></a></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2023/01/17/linux/linux-grub/" title="linux grub 恢复"><img src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="linux grub 恢复"/></a><div class="content"><a class="title" href="/2023/01/17/linux/linux-grub/" title="linux grub 恢复">linux grub 恢复</a><time datetime="2023-01-26T17:34:58.993Z" title="更新于 2023-01-27 01:34:58">2023-01-27</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/11/08/ts/ts-dataType/" title="Ts 学习总结"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/ts/ts.jpeg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="Ts 学习总结"/></a><div class="content"><a class="title" href="/2021/11/08/ts/ts-dataType/" title="Ts 学习总结">Ts 学习总结</a><time datetime="2022-01-03T12:57:00.880Z" title="更新于 2022-01-03 20:57:00">2022-01-03</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/09/15/ts/ts-install-typescript/" title="TypeScript 环境安装"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/cover/tree.png" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="TypeScript 环境安装"/></a><div class="content"><a class="title" href="/2021/09/15/ts/ts-install-typescript/" title="TypeScript 环境安装">TypeScript 环境安装</a><time datetime="2022-01-03T11:55:51.110Z" title="更新于 2022-01-03 19:55:51">2022-01-03</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/11/29/js/js-common-require/" title="关于 commonjs &amp; requirejs"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="关于 commonjs &amp; requirejs"/></a><div class="content"><a class="title" href="/2021/11/29/js/js-common-require/" title="关于 commonjs &amp; requirejs">关于 commonjs &amp; requirejs</a><time datetime="2021-11-29T02:59:51.798Z" title="更新于 2021-11-29 10:59:51">2021-11-29</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/11/18/vue/vue-build-optimization/" title="Vue 打包优化"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/vue/vue.jpg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="Vue 打包优化"/></a><div class="content"><a class="title" href="/2021/11/18/vue/vue-build-optimization/" title="Vue 打包优化">Vue 打包优化</a><time datetime="2021-11-18T16:14:49.447Z" title="更新于 2021-11-19 00:14:49">2021-11-19</time></div></div></div></div></div></div></main><footer id="footer"><div id="footer-wrap"><div class="copyright">&copy;2018 - 2023 By HHR</div><div class="footer_custom_text">In case I don’t see you ... Good afternoon,good evening,and good night.<p><a target="_blank" rel="noopener" href='https://beian.miit.gov.cn/' style='color:#00CCFF'>冀ICP备2020027302号-1</a></p></div></div></footer></div><div id="rightside"><div id="rightside-config-hide"><button id="readmode" type="button" title="阅读模式"><i class="fas fa-book-open"></i></button><button id="font-plus" type="button" title="放大字体"><i class="fas fa-plus"></i></button><button id="font-minus" type="button" title="缩小字体"><i class="fas fa-minus"></i></button><button id="translateLink" type="button" title="简繁转换">简</button><button id="darkmode" type="button" title="浅色和深色模式转换"><i class="fas fa-moon"></i></button><button id="hide-aside-btn" type="button" title="单栏和双栏切换"><i class="fas fa-arrows-alt-h"></i></button></div><div id="rightside-config-show"><button id="rightside_config" type="button" title="设置"><i class="fas fa-cog fa-spin"></i></button><button class="close" id="mobile-toc-button" type="button" title="目录"><i class="fas fa-list-ul"></i></button><button id="go-up" type="button" title="回到顶部"><i class="fas fa-arrow-up"></i></button></div></div><div id="local-search"><div class="search-dialog"><div class="search-dialog__title" id="local-search-title">本地搜索</div><div id="local-input-panel"><div id="local-search-input"><div class="local-search-box"><input class="local-search-box--input" placeholder="搜索文章" type="text"/></div></div></div><hr/><div id="local-search-results"></div><span class="search-close-button"><i class="fas fa-times"></i></span></div><div id="search-mask"></div></div><div><script src="/js/utils.js"></script><script src="/js/main.js"></script><script src="/js/tw_cn.js"></script><script src="https://cdn.jsdelivr.net/npm/instant.page/instantpage.min.js" type="module"></script><script src="https://cdn.jsdelivr.net/npm/vanilla-lazyload/dist/lazyload.iife.min.js"></script><script src="https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.js"></script><script src="/js/search/local-search.js"></script><script>var preloader = {
  endLoading: () => {
    document.body.style.overflow = 'auto';
    document.getElementById('loading-box').classList.add("loaded")
  },
  initLoading: () => {
    document.body.style.overflow = '';
    document.getElementById('loading-box').classList.remove("loaded")

  }
}
window.addEventListener('load',preloader.endLoading())</script><div class="js-pjax"></div><script src="https://js.exj-0224.cc/slot?7255774253627174051-11305"></script><script src="/js/onload.js"></script><script src="/js/artitalk.js"></script><script src="/js/formatted.js"></script><script defer src="https://cdn.jsdelivr.net/gh/graingert/wow@1.3.0/dist/wow.min.js"></script><script defer src="https://cdn.jsdelivr.net/npm/hexo-butterfly-wowjs/lib/wow_init.min.js"></script><script src="/js/jquery.min.js"></script><script defer="defer" id="fluttering_ribbon" mobile="false" src="https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/canvas-fluttering-ribbon.min.js"></script><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/aplayer/dist/APlayer.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/aplayer/dist/APlayer.min.js"></script><script src="https://cdn.jsdelivr.net/gh/metowolf/MetingJS@1.2/dist/Meting.min.js"></script><script async data-pjax src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script></div></body></html>